From 3cb05b57673ba96d02f4ddf1e402166c614ad5fe Mon Sep 17 00:00:00 2001 From: Warren Toomey Date: Wed, 9 Mar 2016 06:47:48 +1000 Subject: [PATCH] Added Phils opr.s and kernel notes files --- .gitignore | 1 - src/other/ops.s | 123 +++++++++++++++++++++++++++++++++++++++++++++++ src/sys/NOTES.md | 70 +++++++++++++++++++++++++++ 3 files changed, 193 insertions(+), 1 deletion(-) create mode 100644 src/other/ops.s create mode 100644 src/sys/NOTES.md diff --git a/.gitignore b/.gitignore index 7c14517..ba077a4 100644 --- a/.gitignore +++ b/.gitignore @@ -1,2 +1 @@ bin -sys diff --git a/src/other/ops.s b/src/other/ops.s new file mode 100644 index 0000000..b7a3d50 --- /dev/null +++ b/src/other/ops.s @@ -0,0 +1,123 @@ +" ops and system calls from as7; as.s has no initial symbol table +" so this needs to be included in any assembly of user programs + +" "sys" has it's own sop.s which includes I/O instructions, but lacks +" system call definitions, and lacks some instructions used in +" commands but not in the kernel, so it can't have been the file used +" for user assemblies. + +save = 1 " saves core dump & user area! +getuid = 2 +open = 3 +read = 4 +write = 5 +creat = 6 +seek = 7 +tell = 8 +close = 9 +link = 10 +unlink = 11 +setuid = 12 +rename = 13 +exit = 14 +time = 15 +intrp = 16 +chdir = 17 +chmod = 18 +chown = 19 +" 20 removed +sysloc = 21 " return system addresses +" 22 removed +capt = 23 " capture display? +rele = 24 " release display? +status = 25 " "stat" +smes = 27 +rmes = 28 +fork = 29 + +" List of instruction names and machine code values +" These come from https://raw.githubusercontent.com/simh/ + +sys = 0020000 " "cal i" instruction (trap indirect thru 020) +i = 0020000 " indirect bit + +" memory reference instructions +dac = 0040000 " deposit AC +jms = 0100000 " jump to subroutine +dzm = 0140000 " deposit zero in memory +lac = 0200000 " load AC +xor = 0240000 " exclusive or +add = 0300000 " one's complement add +tad = 0340000 " two's complement add +xct = 0400000 " execute +isz = 0440000 " increment and skip if zero +and = 0500000 " AND with contents of Y +sad = 0540000 " skip if AC different from content of Y +jmp = 0600000 " jump to Y + +" Type 177 Extended Arithmetic Element (EAE) +eae = 0640000 " base instruction (nop) +osc = 0640001 " OR SC into AC +omq = 0640002 " OR MQ into AC +cmq = 0640004 " Complement MQ +div = 0640323 " divide +norm = 0640444 " normalize unsigned +lls = 0640600 " long left shift +als = 0640700 " AC shift +lrs = 0640500 " long right shift +lacs = 0641001 " load AC with SC +lacq = 0641002 " load AC with MQ +abs = 0644000 " absolute value +divs = 0644323 " divide signed + +clq = 0650000 " clear MQ +frdiv = 0650323 " fractional divide +lmq = 0652000 " load MQ from AC +mul = 0653122 " multiply +idiv = 0653323 " integer divide +idivs = 0657323 " integer divide signed +frdivs = 0654323 " fractional divide signed +muls = 0657122 " multiply signed + +norms = 0660444 " normalize signed +gsm = 0664000 " get sign and magnitude +lrss = 0660500 " long right shift signed +llss = 0660600 " long left shift signed +alss = 0660700 " AC left shift signed + +" Operate Instructions + +" Group 1 (OPR 1) instructions +opr = 0740000 " base operate instruction (nop) +nop = 0740000 +cma = 0740001 " complement accumulator +cml = 0740002 " complement link +oas = 0740004 " inclusive or accumulator switches +ral = 0740010 " rotate (ac link) left +rar = 0740020 " rotate (ac link) right +hlt = 0740040 " HALT +xx = 0740040 +sma = 0740100 " skip on minus accumulator +sza = 0740200 " skip on zero accumulator +snl = 0740400 " skip on non-zero link + +skp = 0741000 " unconditional skip +spa = 0741100 " skip on positive accumulator +sna = 0741200 " skip on negative accumulator +szl = 0741400 " skip on zero link + +rtl = 0742010 " rotate two left (ral*2) +rtr = 0742020 " rotate two right (rar*2) + +cll = 0744000 " clear link +stl = 0744002 " set link +rcl = 0744010 " clear link rotate left +rcr = 0744020 " clear link rotate right + +cla = 0750000 " clear accumulator +clc = 0750001 " clear and complement acc +las = 0750004 " load acc from switches +glk = 0750010 " get link + +" Group 2 operate +law = 0760000 " load accumulator with (instruction) diff --git a/src/sys/NOTES.md b/src/sys/NOTES.md new file mode 100644 index 0000000..6a33dd1 --- /dev/null +++ b/src/sys/NOTES.md @@ -0,0 +1,70 @@ +PROCESSES +========= + +uid -1 is superuser + +process 1 is "init", runs as superuser + +DISK +==== + +``` +RB09: Burroughs fixed head disk (same hardware as RD10!) + +64 word sectors; 80 sectors/track; 100 tracks/surface; 2 surfaces +8000 sectors/surface +one surface reserved for backup + +512,000 words per surface: 1,024,000 characters!!! + +first disk block is copy of "system data" + contains time, free block information, process (user) list?!! + +12 word inodes (5 per block) +710 sectors of inodes (max 3550 files) +``` + +inode format +------------ +``` + i.flags + 400000 free?? (checked/toggled by icreat) + 200000 large file + 000040 special file + 000020 directory + 000017 can be changed by chmod. + 10 owner read + 04 owner write + 02 world read + 01 world write + i.dskps 7 block numbers (all indirect blocks if "large file") + i.uid owner + i.nlks link count + i.size size (in words?) + i.uniq unique value assigned at creation +``` + +directory files can (only) be truncated by superuser + +directory node (dnode) format +----------------------------- +``` + d.i i-number of file + d.name four words, space padded + d.uniq i.uniq value of file +``` + +i numbers +--------- +``` + 1 core file?? (written by "sys save" or bad system call) + 2 "dd"??? "root" directory + 3 "system"??? default process cdir, must contain "init", "dd" + + 6 "ttyin" special file + 7 "keyboard" (graphic-2) special file + 8 "pptin"?? (paper tape reader) special file + 10 "ttyout" special file + 11 "display" (graphic-2) special file + 12 "pptout" (paper tape punch) special file +```